#!D:/CODE/python
# -*- coding: utf-8 -*-
# @Time : 2020/5/25 23:12
# @Author : Alexdong
# @Site : 
# @File : 正则表达式1.py
# @Software: PyCharm
# Functional description:
import re

result = re.match(r"[hH]Hello", "Hello world")
print(result.group())